A Temperature-Insensitive High-Precision Wide-Range Relaxation Oscillator

Abstract

The invention discloses a high-precision wide-range relaxation oscillator which is insensitive to temperature, including a bias voltage (101), a reference current (102), a programmable current mirror (103), a relaxation oscillator unit (104) and a shaping Logic (105) module; provide programmable charge and discharge current for the relaxation oscillator unit through bias voltage (101), reference current (102) and programmable current mirror (103), so as to realize wide-range frequency characteristics of multi-band output; through The frequency adjustment and temperature compensation technology in the reference current (102) realizes the coarse adjustment and fine adjustment of the output frequency of each frequency band, and produces a high-precision output clock; at the same time, it uses the positive temperature coefficient characteristics of the resistance and the negative temperature coefficient characteristics of the triode to achieve full temperature Within the range, the output frequency of the oscillator is insensitive to temperature and has good temperature drift characteristics; the shaping logic (105) compares the output waveform of the relaxation oscillator unit, multiplies the frequency, and feedbacks the charging and discharging of the capacitor, and finally outputs a clock signal of the target frequency. The relaxation oscillator proposed in this patent has the characteristics of wide output frequency range, high precision and insensitivity to temperature.

Description

technical field [0001] The present invention mainly relates to the field of high-performance clock design, in particular to a high-precision wide-range relaxation oscillator structure that is not sensitive to temperature. The negative temperature characteristic of the triode is compensated for the temperature drift coefficient, which makes it possible to generate a high-precision wide-range clock that is not sensitive to temperature. Background technique [0002] Oscillators are an important part of many electronic systems, from clock generation in microprocessors to carrier synthesis in cellular phones, oscillators are ubiquitous, and in different applications, the requirements for the structure and performance parameters of oscillators vary widely. big difference. Oscillators are generally classified into relaxation oscillators (also known as RC oscillators), inductor capacitor oscillators, crystal oscillators, tuning fork oscillators, etc. The relaxation oscillator is t...

AI Technical Summary

Problems solved by technology

Since polysilicon resistance varies by ±10% with temperature, voltage, and process angle, and MOS capacitance varies by more than ±10% with voltage, temperature, and process angle, and delay changes introduced by inverters, buffers, etc. eventually lead to output Clock CLK frequency may have ±20% deviation

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